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'They have detailed knowledge there that would lead to the successful prosecution of offenders.'

Inspector Hansen urged the caller to contact police again, and reminded the public that a $250,000 reward and immunity from prosecution were on offer.

He said like other witnesses to cold cases, the caller appeared to have had a 'change of heart' and may have become a different person in the 12 years since the murder.

The mystery caller had detailed knowledge of the crime and gave police specific information

'There are certainly people who have changed their lifestyle — they're no longer in that scene,' he said.

'They have now provided us information that was not available to the original investigators.'

Inspector Hansen said the tip on Saturday night was one of 15 calls prompted by coverage of the arrest of Danielle Lee Fels earlier that day.

The 34-year-old was charged with two counts of murder and one count each of arson and possessing a dangerous drug.

Fels cried in the dock during her brief appearance at the Redcliffe Magistrates Court on Monday morning.

Outside court, one of Fels' family members told reporters 'we love her' and that police 'do not have the full story'.

April's daughter, Violet (L), joined Detective Inspector Damien Hansen (R) in making the fresh appeal for information on Monday

Fels was remanded in custody and her case adjourned to December 20.

April's daughter, Violet, joined Inspector Hansen in making the fresh appeal for information on Monday.

Now aged 17, the teenager was just four years old at the time and found uninjured at fire-ravaged home at Deception Bay where Ian and April were found dead on May 28, 2004.

Violet said she wanted justice for her family and pleaded with anyone with information to come forward.

'It’s been quite a struggle but thank you to all the people who have been giving information, it does mean a lot to my family and I that something has been happening and things are changing for us,' she said.

Now aged 17, the teenager was just four years old at the time and found uninjured at fire-ravaged home at Deception Bay where Ian and April were found dead on May 28, 2004

'I would appreciate so much for you to come forward, I would be very thankful for you to do it,'

'I do want to move on... I do hope that justice does get served for them.'

'I hope the other people work out that their life of freedom isn't going to happen for them and things are going to change.'

Violet said she hoped the community would support the family and children of Fels and others who may be arrested, and not blame them for their relative's crime.

She said she had to 'grow up very fast' and frequently explain the loss of her mother and uncle to people.

'It's quite scary at times, but also amusing to see their expressions when they don't know how to respond,' she said.

Violet said she wanted justice for her family and pleaded with anyone with information to come forward

Violet previously made a public plea for information in December, leading investigators to interview a number of people again, as well as Fels' arrest.

She said the process had helped her relieve a lot of anger and sadness about the murders, but that she was unhappy people had kept information to themselves for 12 years.

Fels was was identified after police used new technology to analyse triple-zero calls made before the house fire.

Police said the arrested woman was an associate of the siblings and part of the alleged motive in their killing was drug-related.

Violet previously made a public plea for information in December (pictured), leading investigators to interview a number of people again, as well as Fels' arrest